Question

In all the Mendel’s experiments, the two alleles causing a trait were:

Options

• dominant-recessive

• codominant

• incompletely dominant

• corecessive

Answer 1

dominant-recessive

Explanation:

In all of Mendell’s experiments, the two alleles causing a trait exhibited a dominant-recessive relationship. Mendel observed that when he crossed two pure strains of pea plants differing in a trait, the offspring (F₁ generation) showed only the dominant trait, while the recessive trait was masked. However, the recessive trait reappeared in the F₂ generation in a 3:1 ratio. This demonstrated that one allele was dominant and the other recessive, which is the foundation of Mendel’s law of dominance and segregation.